(tests) Stronger assertions

test.py

@@ -35,9 +35,11 @@ class TestProxy(unittest.TestCase):
         stop = await start()
         self.add_async_cleanup(stop)
 
-        with self.assertRaises(DnsResponseCode):
+        with self.assertRaises(DnsResponseCode) as cm:
             await resolve('www.google.com', TYPES.A)
 
+        self.assertEqual(cm.exception.args[0], 5)
+
     @async_test
     async def test_e2e_match_all(self):
         resolve, clear_cache = get_resolver(3535)
@@ -82,9 +84,11 @@ class TestProxy(unittest.TestCase):
         stop = await start()
         self.add_async_cleanup(stop)
 
-        with self.assertRaises(DnsResponseCode):
+        with self.assertRaises(DnsResponseCode) as cm:
             await resolve('www.google.com', TYPES.A)
 
+        self.assertEqual(cm.exception.args[0], 2)
+
     @async_test
     async def test_e2e_default_resolver_match_none_non_existing_domain(self):
         resolve, clear_cache = get_resolver(53)
@@ -93,9 +97,11 @@ class TestProxy(unittest.TestCase):
         stop = await start()
         self.add_async_cleanup(stop)
 
-        with self.assertRaises(DnsResponseCode):
+        with self.assertRaises(DnsResponseCode) as cm:
             await resolve('doesnotexist.charemza.name', TYPES.A)
 
+        self.assertEqual(cm.exception.args[0], 5)
+
 
 def get_socket(port):
     def _get_socket():